"Simon had never looked so at ease with his best girls by his side," a source told The Mirror. "His mom was his perfect date. And when he wasn't with mom, he engaged in a little harmless flirting with Sinitta.

"Nobody asked Simon where Mezhgan was. He just looked comfortable with Sinitta and his mom. But with the amount of time Simon was spending with Sinitta, everyone was joking why the two of them weren't a couple."

Cowell is believed to have helped raise more than £64,000 ($99,350) for dog charity Hope Sanctuary at the fundraiser.